Sealing Rings for Commercial Trucks, Trailers & Heavy Equipment

Sealing rings — including O-rings, backup rings, seal rings, and other ring-style seals — are critical components in the sealing systems of commercial trucks, trailers and heavy equipment. At Custom Truck One Source, our “Rings” category provides a wide selection of heavy-duty sealing rings engineered to maintain fluid-tight and pressure-tight seals in hydraulic systems, fuel/coolant systems, gearboxes, pump housings, bearing housings and other critical assemblies.

What Are Sealing Rings & Why They Matter

A sealing ring is a component placed between two mating surfaces (such as housings, flanges, shafts or cylinder bores) to prevent leakage of fluids (oil, coolant, fuel, hydraulic fluid) or ingress of contaminants (dirt, moisture, dust). Proper sealing is essential to maintain pressure, avoid fluid loss, protect internal components, and maintain safe, reliable operation under load, vibration, temperature variation, and harsh environmental exposure.

In heavy-duty trucks, trailers, service rigs or equipment — where hydraulic cylinders, transmissions, fuel systems, bearings, or gearboxes are common — robust sealing rings help ensure system integrity, reduce downtime, and extend component service life.

Types of Sealing Rings & Typical Uses

Depending on the application and sealing requirements, sealing rings may include:

• O-rings: The most common type — elastomer (rubber or synthetic) rings with circular cross-sections that compress to create a seal; used in hydraulic cylinders, fluid lines, pumps, valves, fuel or coolant systems, and static or dynamic interfaces.

• Backup Rings / Anti-extrusion Rings: Often used in combination with O-rings to support them under high-pressure or dynamic conditions, preventing extrusion or deformation of the softer O-ring material and extending seal life.

• Seal Rings (Mechanical / Face Seals): For more demanding applications — such as rotating shafts, pump shafts or high-pressure fluid sealing — rigid or semi-rigid seal rings (sometimes part of a mechanical seal assembly) may be used to maintain tight sealing under high pressure, temperature or abrasive conditions.

• Composite or Specialty Rings: Sealing rings made from materials suited to specific needs — e.g. chemical resistance, high-temperature resistance, or compatibility with oils, fuels, hydraulic fluids — to match the demands of engines, hydraulics, fuel systems or industrial environments.

How to Choose the Right Sealing Ring

When selecting a sealing ring for trucks, trailers or heavy equipment, consider:

• Sealing application (static vs dynamic): Static joints (flanges, housings) can often use standard O-rings or flat seals; dynamic seals (hydraulic cylinders, rotating shafts) require rings designed for motion, pressure cycles, and wear resistance.

• Fluid / chemical / temperature compatibility: Choose a ring material compatible with the fluid or environment — e.g. oil, hydraulic fluid, coolant, fuel, or exposure to heat, chemicals, or contaminants — to ensure long-term seal integrity.

• Pressure rating and mechanical load: High-pressure systems (hydraulics, pumps) may need O-rings plus backup rings, or mechanical seal rings, to avoid extrusion or seal failure under pressure.

• Size, groove/ housing compatibility and installation quality: Sealing rings must match the exact dimensions (internal diameter, cross-section, groove dimensions) and be installed correctly — poor fit or mis-installation can cause leaks or premature failure.

Maintenance & Replacement Guidelines

• Always inspect sealing rings during service or maintenance — look for signs of wear, cracking, deformation, swelling, extrusion or chemical degradation. Replace any ring showing signs of failure before problems arise.

• Replace rings anytime a sealed joint is disassembled — reuse of old rings often leads to leaks or seal failure.

• For high-pressure or critical applications, consider using backup rings or heavy-duty seal rings to ensure long-term reliability.

• Use correct installation practices (clean mating surfaces; ensure proper groove dimension and ring seating; avoid damaging the ring during installation) to maximize seal life.

Why Choose Custom Truck One Source for Sealing Rings

• Our inventory includes a broad range of heavy-duty sealing rings — from standard elastomeric O-rings to backup rings and mechanical seal rings — suitable for trucks, trailers, hydraulics, pumps, engines, and heavy equipment.

• We stock sealing rings in multiple materials and specifications — ensuring compatibility with oils, fuels, coolant, hydraulic fluid, temperature extremes, and heavy-duty environments.

• Our parts-specialist team understands heavy-duty vehicle and equipment sealing needs — helping you choose the right ring, verify fitment, and ensure reliable sealing for high-load or fluid-system applications.

• With nationwide distribution and ready availability, we support fast replacement or maintenance — helping minimize downtime and protect equipment integrity.

Browse & Order — Get the Right Sealing Ring for Your Application

Explore our range of sealing rings — filter by ring type (O-ring, backup ring, mechanical seal ring), material, size, application (hydraulic, fuel, coolant, gearbox, housing), or part number. Order online or call our parts team at 877-831-0572 for technical support and help matching ring specs to your equipment.